TWI606346B - Detecting circuit - Google Patents

Description

Detection circuit

The present invention relates to a detection circuit, and more particularly to a detection circuit for a hard disk type.

With the advent of technology life, computers have become an indispensable tool in life, and the market demand for computer equipment is getting higher and higher. One of the most important objects in computer equipment is the server system. In general, in order to meet the needs of the market, server systems usually have to have powerful data processing capabilities and large capacity storage capacity. In order to meet market demand, it is usually necessary to set multiple hard disks in the server. However, the types of these hard disks may be different. Therefore, when multiple different types of hard disks are mixed and matched, it is a great challenge and challenge to distinguish the hard disk type corresponding to each hard disk.

The detection circuit proposed by the present invention can perform a search in a preset information table by using a set of judgment signals to determine the type of the hard disk.

According to an embodiment of the invention, a detection circuit is disclosed, including a first backplane, a motherboard, and a processor. The first backplane is configured to allow a plurality of hard disks to be pluggably inserted into the first backplane, wherein each hard disk provides an input signal. The main board is electrically connected to the first backboard. The main board is configured to generate a set of judgment signals according to the input signal and the plurality of reference voltages. The processor is electrically connected to the motherboard, and the processor searches the preset information table according to the group judgment signal to determine the type of the hard disk corresponding to one of the hard disks.

The reference voltages include a first reference voltage, a second reference voltage, and a third reference voltage, and the set of determination signals includes a first signal, a second signal, and a third signal. The main board includes a judging circuit electrically connected to the first backboard, and the judging circuit includes a first comparing circuit, a second comparing circuit and a third comparing circuit. The first comparison circuit is configured to compare the input signal with the first reference voltage to generate the first signal. The second comparison circuit is configured to compare the input signal with the second reference voltage to generate a second signal. The third comparison circuit is configured to compare the input signal with the third reference voltage to generate a third signal.

The potential of the third reference voltage is greater than the potential of the second reference voltage, the potential of the second reference voltage is greater than the potential of the first reference voltage, and the processor is based on the potential of the first signal, the potential of the second signal, and the potential of the third signal. Find the default information table and determine the type of hard disk corresponding to one of the hard disks.

The preset information table includes a plurality of hard disk types, and the processor identifies one of the hard disk types from the preset information table according to the potential of the first signal, the potential of the second signal, and the potential of the third signal. The type of hard disk recognized is the type of hard disk corresponding to one of the hard disks.

The hard disk type includes a first hard disk type, a second hard disk type, and a third hard disk type. When the potential of the input signal is greater than a potential of the first reference voltage and less than or equal to a potential of the second reference voltage, the processor Determining that the hard disk type corresponding to one of the hard disks is a first hard disk type, and when the potential of the input signal is greater than the second reference voltage and less than or equal to the potential of the third reference voltage, the processor determines the hard disks The hard disk type corresponding to one of the hard disk types is a second hard disk type. When the potential of the input signal is greater than the potential of the third reference voltage, the processor determines that the hard disk type corresponding to one of the hard disks is the first type. Three hard disk types.

The processor determines the potential of the third signal. If the processor determines that the potential of the third signal is low, the processor further determines the potential of the second signal, and if the processor determines the potential of the second signal and the potential of the third signal, When the potential is low, the processor further determines the potential of the first signal to determine the type of hard disk corresponding to one of the hard disks.

When the processor determines that the potential of the second signal is high, the processor further determines the potential of the third signal. When the processor determines that the potential of the second signal is low, the processor further determines the potential of the first signal. To determine the type of hard disk corresponding to one of the hard disks.

The first comparison circuit includes a first comparator, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor. The first comparator has a first input, a second input, and a first output, and the first input receives the input signal. The first resistor has a first end and a second end. The first end of the first resistor is electrically connected to the second input end, and the second end of the first resistor receives the standby voltage. The second resistor has a first end and a second end. The first end of the second resistor is electrically connected to the second input end, and the second end of the second resistor receives the ground voltage. The third resistor has a first end and a second end. The first end of the third resistor is electrically connected to the first input end, and the second end of the third resistor is electrically connected to the first output end. The first capacitor has a first end and a second end, the first end of the first capacitor receives the first operating voltage, and the second end of the first capacitor receives the ground voltage. The second capacitor has a first end and a second end. The first end of the second capacitor is electrically connected to the second input end, and the second end of the second capacitor receives the ground voltage.

The second comparison circuit and the third comparison circuit respectively include a second comparator, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor and a fourth capacitor. The second comparator has a first input, a second input and a first output, and the first input receives the input signal. The fourth resistor has a first end and a second end. The first end of the fourth resistor is electrically connected to the second input end, and the second end of the fourth resistor receives the standby voltage. The fifth resistor has a first end and a second end. The first end of the fifth resistor is electrically connected to the second input end, and the second end of the fifth resistor receives the ground voltage. The sixth resistor has a first end and a second end. The first end of the sixth resistor is electrically connected to the first input end, and the second end of the sixth resistor is electrically connected to the first output end. The third capacitor has a first end and a second end. The first end of the third capacitor is electrically connected to the first output end, and the second end of the third capacitor receives the ground voltage. The fourth capacitor has a first end and a second end. The first end of the fourth capacitor is electrically connected to the second input end, and the second end of the fourth capacitor receives the ground voltage.

The motherboard includes a pull-up resistor having a first end and a second end, the first end of the pull-up resistor receives the standby voltage, and the second end of the pull-up resistor is electrically connected to the first backplane and the judging circuit, and the resistor of the pull-up resistor The value is essentially 5.1 kilo ohms.

In summary, in the operation of the detecting circuit provided by the present invention, a set of determining signals is generated by using an input signal and a reference signal provided by the hard disk, and the set of determining signals and the preset information table are utilized. Then determine the type of hard disk corresponding to the hard disk.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1. FIG. 1 is a functional block diagram of a detection circuit according to an embodiment of the invention. As shown in FIG. 1, the detection circuit 1 includes a first backplane 10, a motherboard 12, and a processor 14. The first backplane 10 is configured to allow the first hard disk 102, the second hard disk 104, and the third hard disk 106 to be plugged into the first backplane 10. The first hard disk 102, the second hard disk 104, and the third hard disk 106 respectively provide an input signal Vin. In this embodiment, the first hard disk 102, the second hard disk 104, and the third hard disk 106 are all different types of hard disks. The main board 12 is electrically connected to the first backboard 10 and receives an input signal Vin. The main board 12 generates a set of determination signals Vdet according to the input signal Vin and the plurality of reference signals. The processor 14 is electrically connected to the main board 12, and searches for a preset information table according to the set of determination signals Vdet, thereby determining the hard disk type of one of the first hard disk 102, the second hard disk 104, and the third hard disk 106.

In an embodiment, as shown in FIG. 1 , the main board 12 includes a judging circuit 120 electrically connected to the first back board 10 . The plurality of reference voltages include a first reference voltage Vf1, a second reference voltage Vf2, and a third reference voltage Vf3. The determination circuit 120 includes a first comparison circuit 1201, a second comparison circuit 1203, and a third comparison circuit 1205. The first comparison circuit 1201 is configured to compare the input signal Vin with the first reference voltage Vf1 to generate the first signal Va. The second comparison circuit 1203 is configured to compare the input signal Vin with the second reference voltage Vf2 to generate a second signal Vb. The third comparison circuit 1205 is configured to compare the input signal Vin with the third reference voltage Vf3 to generate a third signal Vf3. In practice, the comparison circuit is a common comparator, which can compare the input voltage with a reference voltage, and generate a high-level or low-level signal according to the comparison result for use in subsequent circuits. .

In one embodiment, the potential of the third reference voltage Vf3 is greater than the potential of the second reference voltage Vf2, the potential of the second reference voltage Vf2 is greater than the potential of the first reference voltage Vf1, and the processor 14 is based on the potential of the first signal Va. The potential of the second signal Vb and the potential of the third signal Vc are searched for a preset information table and judge the type of the hard disk corresponding to one of the hard disks. In one embodiment, the potential of the first reference voltage Vf1 is 0.5 volts, the potential of the second reference voltage Vf2 is 1.5 volts, and the potential of the third reference voltage Vf3 is 2.5 volts.

Referring to Table 1, Table 1 is a preset information table according to an embodiment of the present invention. As shown in Table 1, when the potential of the input signal Vin is less than the first reference voltage Vf1 and less than or equal to the potential of the second reference voltage Vf2, the processor 14 determines that the hard disk type is the first hard disk type. When the potential of the input signal Vin is greater than the first reference voltage Vf1 and less than or equal to the potential of the second reference voltage Vf2, the processor 14 determines that the hard disk type corresponding to the hard disk providing the input signal Vin is the first hard disk type. When the potential of the input signal Vin is greater than the second reference voltage Vf2 and less than or equal to the potential of the third reference voltage Vf3, the processor 14 determines that the hard disk type corresponding to the hard disk providing the input signal Vin is the second hard disk type. When the potential of the input signal Vin is greater than the third reference voltage Vf3, the processor 14 determines that the hard disk type corresponding to the hard disk providing the input signal Vin is the third hard disk type. It should be noted that the potential of the input signal Vin shown in Table 1 is for illustrative purposes only, and the present invention is not limited thereto. Table I         <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Potential of input signal Vin</td><td> Potential of first signal Va</td ><td> Potential of second signal Vb</td><td> Potential of third signal Vc</td><td> Hard disk type</td></tr><tr><td> Vin<0.5 (Volts) </td><td> 0 </td><td> 0 </td><td> 0 </td><td> N/A </td></tr><tr><td > 0.5 (volts) < Vin < 1.5 (volts) </td><td> 1 </td><td> 0 </td><td> 0 </td><td> first hard disk type </ Td></tr><tr><td> 1.5 (volts) < Vin<2.5 (volts) </td><td> 1 </td><td> 1 </td><td> 0 </td ><td> Second hard disk type</td></tr><tr><td> Vin>2.5 (volts) </td><td> 1 </td><td> 1 </td>< Td> 1 </td><td> Third hard drive type</td></tr></TBODY></TABLE>

In one embodiment, the processor 14 determines the hard disk type by determining the level of the first signal Va, the second signal Vb, and the third signal Vc in the preset information table. For example, in one embodiment, the processor 14 first determines the potential of the third signal Vc. If the processor 14 determines that the potential of the third signal Vc is low, the processor 14 further determines the second signal Vb. Potential. If the processor 14 determines that the potential of the second signal Vb and the potential of the third signal Vc are both low, the processor further determines the potential of the first signal Va to determine that one of the hard disks corresponds to Hard disk type. The low potential and the high potential described in the present invention are represented by 0 and 1, respectively. In a specific example, it is assumed that the first hard disk 102 provides the input signal Vin to the determining circuit 120, and the first comparing circuit 1201, the second comparing circuit 1203 and the third comparing circuit 1205 respectively output the first signal Va and the second. The signal Vb and the third signal Vc are supplied to the processor 14.

First, the processor 14 first determines the potential of the third signal Vc. If the potential of the third signal Vc is low (i.e., 0), the processor 14 further determines the potential of the second signal Vb. If the potential of the second signal Vb is also low (i.e., 0), the processor 14 further determines the potential of the first signal Va. It is assumed that in this example, the potential of the first signal Va is high (that is, 1), and the processor 14 can obtain the potentials of the first signal Va, the second signal Vb, and the third signal Vc, respectively, being 1,0. 0. In this way, the processor 14 can find the first hard disk type in Table 1, thereby determining that the first hard disk 102 corresponds to the first hard disk type.

In the foregoing example, the processor 14 first determines the potential of the third signal Vc. In another embodiment, the processor 14 first determines by the potential of the second signal Vb. When the processor 14 determines that the potential of the second signal Vb is high, the processor 14 further determines the potential of the third signal Vc. After the processor 14 determines that the potential of the second signal Vb is low, the processor 14 further determines the potential of the first signal Va to determine the type of the hard disk corresponding to one of the hard disks. As a practical example, it is assumed that the second hard disk 104 supplies the input signal Vin to the decision circuit 120 to generate the corresponding first signal Va, second signal Vb and third signal Vc. The processor 14 first determines the potential of the second signal Vb. Assuming that the potential of the second signal Vb is high, at this time, the processor 14 further determines the potential of the third signal Vc. If the potential of the third signal Vc is low, the processor 14 can find in the first table that the second hard disk 104 corresponds to the second hard disk type. It should be noted that in the embodiment of Table 1, when the first signal Va, the second signal Vb, and the third signal Vc are both at a low potential, the corresponding hard disk type cannot be found.

Please refer to FIG. 2. FIG. 2 is a circuit diagram of a judging circuit according to an embodiment of the invention. In this embodiment, as shown in FIG. 2, the first comparison circuit 1201 includes a comparator OP1, resistors R1 to R3, and capacitors C1 to C2. The comparator OP1 has a first input, a second input and a first output. The first input receives the input signal Vin. The resistor R1 has a first end and a second end, the first end of which is electrically connected to the second input end of the comparator OP1, and the second end of which receives the standby voltage VST. The second resistor R2 has a first end and a second end, the first end of which is electrically connected to the second input end of the comparator OP1, and the second end of which receives the ground voltage GND. The resistor R3 has a first end and a second end, the first end of which is electrically connected to the first input end of the comparator OP1, and the second end of which is electrically connected to the first output end of the comparator OP1. The capacitor C1 has a first end and a second end, the first end of which receives the operating voltage VD and the second end of which receives the ground voltage GND. The capacitor C2 has a first end and a second end, the first end of which is electrically connected to the second input end of the comparator OP1, and the second end of which receives the ground voltage GND.

Specifically, in this embodiment, the first comparison circuit 1201 receives the input signal Vin from the hard disk by the first input terminal, and compares the first reference voltage Vf1 with the input signal Vin, thereby generating a corresponding first signal Va. . In one example, the resistance of resistor R1 is 5.62 kilohms. The resistance value of the resistor R2 is 1 kilo ohm. The resistance value of the resistor R3 is 10 megaohms. The capacitance values of capacitor C1 and capacitor C2 are both 0.1 microfarads. In this example, the first comparison circuit 1201 includes a resistor R10 having a first end and a second end, the first end of which receives the standby voltage VST and the second end of which is electrically coupled to the first output of the comparator OP1. In this example, the resistor R10 is 4.7 kilo ohms. The resistance values and capacitance values in the above embodiments are merely illustrative, and the invention is not limited thereto.

In one embodiment, as shown in FIG. 2, the second comparison circuit 1203 includes a comparator OP2, resistors R4 to R6, and capacitors C3 to C4. The comparator OP2 has a first input, a second input and a first output, the first input of which receives the input signal Vin. The resistor R4 has a first end and a second end, the first end of which is electrically connected to the second input end, and the second end of which receives the standby voltage VST. The resistor R5 has a first end and a second end, the first end of which is electrically connected to the second input end of the comparator OP2, and the second end of which receives the ground voltage GND. The resistor R6 has a first end and a second end, the first end of which is electrically connected to the first input end of the comparator OP2, and the second end of which is electrically connected to the first output end of the comparator OP2. The capacitor C3 has a first end and a second end, the first end of which is electrically connected to the first output end of the comparator OP2, and the second end of which receives the ground voltage GND. The capacitor C4 has a first end and a second end, the first end of which is electrically connected to the second input end, and the second end of which receives the ground voltage GND.

Specifically, the second comparison circuit 1203 receives the input signal Vin from the hard disk by the first input terminal, and compares the second reference voltage Vf2 with the input signal Vin, thereby generating a corresponding second signal Vb. In one example, the resistance of resistor R4 is 1.21 kilo ohms, the resistance of resistor R5 is 1 kilo ohm, and the resistance of resistor R6 is 10 megaohms. Capacitor C3 and capacitor C4 have a capacitance of 0.1 microfarad. In this embodiment, the third comparison circuit 1205 includes a comparator OP3, resistors R7-R9, and capacitors C5-C6. As can be seen from FIG. 2, the circuit structure of the third comparison circuit 1205 is the same as that of the second comparison circuit 1203 described above, and therefore will not be described again. Specifically, the third comparison circuit 1205 receives the input signal Vin from the hard disk by the first input terminal, and compares the third reference voltage Vf3 with the input signal Vin, thereby generating a corresponding third signal Vc. In one example, the resistance of resistor R7 is 374 ohms, the resistance of resistor R8 is 1 kilo ohm, and the resistance of resistor R9 is 10 megaohms. Capacitor C5 and capacitor C6 have a capacitance of 0.1 microfarad. In this embodiment, as shown in FIG. 2, the second comparison circuit 1203 includes a resistor R11 having a first end and a second end, the first end of which receives the standby voltage VST, and the second end of which is electrically connected to the comparator OP2. The first output. In this embodiment, the resistance of the resistor R11 is 4.7 kilohms. The third comparison circuit 1205 includes a resistor R12 having a first end and a second end, the first end of which receives the standby voltage VST and the second end of which is electrically connected to the first output end of the comparator OP3. In this embodiment, the resistance of the resistor R12 is 4.7 kilohms. The resistance values and capacitance values in the above embodiments are merely illustrative, and the invention is not limited thereto.

In an embodiment, as shown in FIG. 2, in the determining circuit 120, the pull-up resistor RP has a first end and a second end, and the first end of the pull-up resistor RP receives the standby voltage VST, and the pull-up resistor RP The two ends are electrically connected to the first backplane 10 and the judging circuit 120. In one example, the pull-up resistor RP is disposed on the main board 14, and the pull-up resistor RP is electrically connected to the first hard disk 102, the second hard disk 104, and the third hard disk 106 of the first backplane 10. An appropriate input signal Vin is output to the decision circuit 120, and a corresponding set of decision signals can be generated to facilitate subsequent search of the hard disk type. In one embodiment, the pull-up resistor has a resistance value of substantially 5.1 kilo ohms. However, the resistance values in the above embodiments are merely illustrative, and the invention is not limited thereto.

Please refer to FIG. 3. FIG. 3 is a circuit diagram of a first hard disk according to an embodiment of the invention. As shown in FIG. 3, the first hard disk 102 has resistors R13 to R15 and a transistor T1 and a transistor T2. The first end of the resistor R13 receives the working voltage VD, and the second end of the resistor R13 is electrically connected to the first end of the transistor T1. The first end of the resistor R15 receives the working voltage VD, and the second end of the resistor R15 is electrically connected to the main control end of the transistor T1. The main terminal of the transistor T2 is electrically connected to the second end of the resistor R15. The first end of the transistor T2 is electrically connected to the first end of the resistor R14 and the second end of the transistor T1. The second end of the resistor R14 receives the ground voltage GND. In this embodiment, the resistance of the resistor R13 is 2.61 kohms. The resistance of the resistor R14 is 2 kilohms. The resistance of the resistor R15 is 100 ohms. Please refer to FIG. 4. FIG. 4 is a circuit diagram of a second hard disk according to an embodiment of the invention. As shown in FIG. 4, the second hard disk 104 has resistors R16 to R18 and a transistor T3 and a transistor T4. The circuit architecture of the second hard disk 104 in FIG. 4 is similar to that of the first hard disk 102 in FIG. 3, and will not be described herein. The difference between the two is in the magnitude of the resistance value. In this embodiment, the resistance values of the resistor R16 and the resistor R17 are both 1 kilo ohm, and the resistance of the resistor R18 is 100 ohms.

Referring to FIG. 5, FIG. 5 is a circuit diagram of a third hard disk according to an embodiment of the invention. As shown in FIG. 5, the third hard disk 106 has resistors R19 to R20 and a transistor T5 and a transistor T6. The first end of the resistor R20 receives the working voltage VD, and the second end of the resistor R20 is electrically connected to the main control end of the transistor T5 and the main control end of the transistor T6. The first end of the resistor R19 is electrically connected to the first end of the transistor T5, and the second end thereof receives the ground voltage GND. The second end of the transistor T5 is electrically connected to the first end of the transistor T6. In this embodiment, the resistance values of the resistor R19 and the resistor R20 are 2 kilo ohms and 100 ohms, respectively. The resistance values in the above embodiments are merely illustrative, and the invention is not limited thereto.

In summary, the detection circuit provided by the present invention causes the determination circuit to generate the first signal, the second signal, and the third signal by using the input signal and the three reference voltages, and according to the potential level, preset The corresponding hard disk type is found in the information table, and when different types of hard disks are mixed and matched, the hard disk type of the hard disk can be distinguished, so that the data can be correctly loaded.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1‧‧‧Detection circuit
10‧‧‧First backplane
12‧‧‧ motherboard
14‧‧‧ Processor
102‧‧‧First hard disk
104‧‧‧second hard disk
106‧‧‧ Third hard disk
120‧‧‧Judgement circuit
1201‧‧‧First comparison circuit
1203‧‧‧Second comparison circuit
1205‧‧‧ third comparison circuit
Vin‧‧‧ input signal
Vdet‧‧‧judgment signal
Va‧‧ first signal
Vb‧‧‧ second signal
Vc‧‧‧ third signal
Vf1‧‧‧ first reference voltage
Vf2‧‧‧second reference voltage
Vf3‧‧‧ third reference voltage
VST‧‧‧Standby voltage
GND‧‧‧ Grounding voltage
R _P ‧‧‧ Pull-up resistor
R1~R9‧‧‧ resistor
R10, R11, R12‧‧‧ pull-up resistors
C1~C6‧‧‧ capacitor

FIG. 1 is a functional block diagram of a detection circuit according to an embodiment of the invention. FIG. 2 is a circuit diagram of a determination circuit according to an embodiment of the invention. FIG. 3 is a circuit diagram of a first hard disk according to an embodiment of the invention. FIG. 4 is a circuit diagram of a second hard disk according to an embodiment of the invention. FIG. 5 is a circuit diagram of a third hard disk according to an embodiment of the invention.

1‧‧‧Detection circuit

10‧‧‧First backplane

12‧‧‧ motherboard

14‧‧‧ Processor

102‧‧‧First hard disk

104‧‧‧second hard disk

106‧‧‧ Third hard disk

120‧‧‧Judgement circuit

1201‧‧‧First comparison circuit

1203‧‧‧Second comparison circuit

1205‧‧‧ third comparison circuit

Vin‧‧‧ input signal

Vdet‧‧‧judgment signal

Claims (9)

A detection circuit includes: a first backplane, wherein a plurality of hard disks are pluggably inserted into the first backplane, wherein each of the hard disks provides an input signal; and a motherboard is electrically connected The first backplane, the motherboard is configured to generate a set of determining signals according to the input signal and the plurality of reference voltages; and a processor electrically connected to the motherboard, the processor searching for a preset according to the group of determining signals A information table to determine a type of hard disk corresponding to one of the hard disks. The detecting circuit of claim 1, wherein the reference voltages comprise a first reference voltage, a second reference voltage, and a third reference voltage, the set of determining signals comprising a first signal and a second signal a third signal, the motherboard includes a determining circuit electrically connected to the first backplane, the determining circuit comprising: a first comparing circuit for comparing the input signal with the first reference voltage to generate the first signal a second comparison circuit for comparing the input signal with the second reference voltage to generate the second signal; and a third comparison circuit for comparing the input signal with the third reference voltage to generate the third a signal, wherein a potential of the third reference voltage is greater than a potential of the second reference voltage, a potential of the second reference voltage is greater than a potential of the first reference voltage, and the processor is configured according to a potential of the first signal, the second The potential of the signal and the potential of the third signal are searched for the preset information table and determine the type of the hard disk corresponding to one of the hard disks. The detecting circuit of claim 2, wherein the preset information table comprises a plurality of hard disk types, and the processor is configured according to the potential of the first signal, the potential of the second signal, and the potential of the third signal. The preset information table identifies one of the hard disk types, and the recognized hard disk type is the hard disk type corresponding to one of the hard disks. The detecting circuit of claim 3, wherein the hard disk types comprise a first hard disk type, a second hard disk type and a third hard disk type, when the potential of the input signal is greater than the first reference When the potential of the voltage is less than or equal to the potential of the second reference voltage, the processor determines that the hard disk type corresponding to one of the hard disks is the first hard disk type, when the potential of the input signal is greater than the When the second reference voltage is less than or equal to the potential of the third reference voltage, the processor determines that the hard disk type corresponding to one of the hard disks is the second hard disk type, when the potential of the input signal is greater than When the potential of the third reference voltage is reached, the processor determines that the hard disk type corresponding to one of the hard disks is the third hard disk type. The detecting circuit of claim 2, wherein the processor determines the potential of the third signal, and if the processor determines that the potential of the third signal is low, the processor further determines the potential of the second signal If the processor determines that the potential of the second signal and the potential of the third signal are both low, the processor further determines the potential of the first signal to determine that one of the hard disks corresponds to The type of hard drive. The detecting circuit of claim 2, wherein when the processor determines that the potential of the second signal is high, the processor further determines a potential of the third signal, and when the processor determines the second signal After the potential is low, the processor further determines the potential of the first signal to determine the type of the hard disk corresponding to one of the hard disks. The detecting circuit of claim 2, wherein the first comparing circuit comprises: a first comparator having a first input end, a second input end and a first output end, the first input end receiving The first resistor has a first end and a second end, the first end of the first resistor is electrically connected to the second input end, and the second end of the first resistor receives a standby voltage; The second resistor has a first end and a second end, the first end of the second resistor is electrically connected to the second input end, the second end of the second resistor receives a ground voltage; and a third resistor has a first The first end of the third resistor is electrically connected to the first input end, and the second end of the third resistor is electrically connected to the first output end; a first capacitor has a first end a second end, the first end of the first capacitor receives a first operating voltage, the second end of the first capacitor receives the ground voltage, and a second capacitor has a first end and a second end, the second The first end of the capacitor is electrically connected to the second input end, and the second end of the second capacitor receives the connection Ground voltage. The detecting circuit of claim 2, wherein the second comparing circuit and the third comparing circuit respectively comprise: a second comparator having a first input end, a second input end and a first output end The first input terminal receives the input signal; a fourth resistor has a first end and a second end, the first end of the fourth resistor is electrically connected to the second input end, and the second end of the fourth resistor Receiving a standby voltage; a fifth resistor having a first end and a second end, the first end of the fifth resistor being electrically connected to the second input end, the second end of the fifth resistor receiving a ground voltage; The sixth resistor has a first end and a second end, the first end of the sixth resistor is electrically connected to the first input end, and the second end of the sixth resistor is electrically connected to the first output end; The capacitor has a first end and a second end, the first end of the third capacitor is electrically connected to the first output end, the second end of the third capacitor receives the ground voltage, and a fourth capacitor has a first The first end of the fourth capacitor is electrically connected to the second input end, and the second end The second terminal of the four capacitor receives the ground voltage. The detecting circuit of claim 2, wherein the main board comprises a pull-up resistor having a first end and a second end, the first end of the pull-up resistor receiving a standby voltage, and the second end of the pull-up resistor The first backplane is electrically connected to the determining circuit, and the resistance of the pull-up resistor is substantially 5.1 kilo ohms.